tools/power/cpupower/utils/helpers/sysfs.h

Source file repositories/reference/linux-study-clean/tools/power/cpupower/utils/helpers/sysfs.h

File Facts

System
Linux kernel
Corpus path
tools/power/cpupower/utils/helpers/sysfs.h
Extension
.h
Size
1440 bytes
Lines
40
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __CPUPOWER_HELPERS_SYSFS_H__
#define __CPUPOWER_HELPERS_SYSFS_H__

#define PATH_TO_CPU "/sys/devices/system/cpu/"
#define MAX_LINE_LEN 255
#define SYSFS_PATH_MAX 255

extern unsigned int sysfs_read_file(const char *path, char *buf, size_t buflen);

extern unsigned int sysfs_idlestate_file_exists(unsigned int cpu,
						unsigned int idlestate,
						const char *fname);

extern int sysfs_is_cpu_online(unsigned int cpu);

extern int sysfs_is_idlestate_disabled(unsigned int cpu,
				       unsigned int idlestate);
extern int sysfs_idlestate_disable(unsigned int cpu, unsigned int idlestate,
				   unsigned int disable);
extern unsigned long sysfs_get_idlestate_latency(unsigned int cpu,
						unsigned int idlestate);
extern unsigned long sysfs_get_idlestate_usage(unsigned int cpu,
					unsigned int idlestate);
extern unsigned long long sysfs_get_idlestate_time(unsigned int cpu,
						unsigned int idlestate);
extern char *sysfs_get_idlestate_name(unsigned int cpu,
				unsigned int idlestate);
extern char *sysfs_get_idlestate_desc(unsigned int cpu,
				unsigned int idlestate);
extern unsigned int sysfs_get_idlestate_count(unsigned int cpu);

extern char *sysfs_get_cpuidle_governor(void);
extern char *sysfs_get_cpuidle_driver(void);

extern int sysfs_get_sched(const char *smt_mc);
extern int sysfs_set_sched(const char *smt_mc, int val);

#endif /* __CPUPOWER_HELPERS_SYSFS_H__ */

Annotation

Implementation Notes